How to replace/change 3rd/third brake light on SLK R170 - Mercedes Benz SLK Forum

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#1 Old 06-16-2013
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Post How to replace/change 3rd/third brake light on SLK R170

Hi there folks!
Got mine smoked 3rd brake light and managed to install it with just a few losses =))
The process can be either quite tricky or quite easy if you decide just to change the lens =)
Se here we start.

1st way:
Either use smth like a wide flat-head screwdriver and a rag (to protect vehicle from scratches) and try to remove the OEM Red lens from the car. Or some people reported that needle nose pliers worked for them =)

2nd way (my way - hard way) Or perhaps it will be useful for people in the future to remove the whole assembly

Open the trunk and remove 3 plastic posts that hold the plastic cover in place.


Cover removed:


Unclip 2 plastic flat pieces that cover the wires. These simply unclip one way.


Then disconnect the LED connector


Disconnect the license plate light connector


Then carefully remove this plastic cover to get access to the brake light housing.


Now, to remove the lens I had to push out all these small plastic tabs (these are attached to the OEM Red plastic lens itself). Be careful not to damage those!


Here's what you will get after it's removed =)


Now you have two routes. Either you just take the new Smoke/Clear lens and snap it in the place and stop here,
or you can change the whole bottom housing as well =)

I broke off couple clips of my Red lens =(


Undo 3 small screws


The housing removed =)


New and old housings with lenses side by side:


Now we need to transfer the LED assembly onto the new housing. Carefully undo 8 clips (4 on each side) to remove the bottom LED assembly.


Then just transfer this LED assembly onto the new housing, and install 3 small posts supplied with the light. This is only for Smoke version! The Clear version comes already assembled!
Also, make sure you align the connector hole where it's supposed to go




Now clean the area and install the housing by screwing 3 screws into the posts:


And then just align the rubber surrounding on the lens and snap in the new Smoke/Clear Lens in place! You're done!

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#2 Old 06-16-2013
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Nice write-up. That is a lot more involved than it is on the R171. End-result looks great!!
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#3 Old 06-16-2013
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got it on Sat and just finished put it in thanks for your picture DYI. Not the best quality but it looks nice. I kind of worry if the water may get in even though i tried to push the cover in as tight as i can, but still can see a bit opening on corner. Is there a silicone sealer we can squeeze it to seal it properly.
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#4 Old 06-17-2013
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Ok Marykay, lets have your installation instructions. Jayson did a get job of showing the hard way, but you said it took only 10 minutes including cocktails. Can you just take the lense off and snap the new one one??

You know me just trying to keep a thread going
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#5 Old 06-17-2013
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With needle nose pliers and a flat head screwdriver gently pry the lens off. It is held on with clips that are located by each light.

Snap the new one on and push til you hear it click in place. Although it clicked in place on the left side it still seems a bit loose. I wondered about the silicone sealant also, but the car was outside in torrential rain and the light was water free, but I do want it sealed.

You could do it before you tee off this morning!

Oh, and afterward...I had a nice cold Sangria (it was 5:00 somewhere)!
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